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  • Can't route specific subnet thru VPN in ubuntu

    - by Disco
    I'm having issues routing traffic thru VPN. Here's my setup I have 3 hosts, let's call them A, B and Z B and Z have a VPN connection in the 10.10.10.x SUBNET A and B have a direct connection in the 10.10.12.x SUBNET I want to be able to route traffic from A to Z, like : A <= 10.10.12.254 [LAN] 10.10.12.111 => B <= 10.10.10.152 [VPN] 10.10.10.10 => Z On host B, i have set up ip_forwarding : net.ipv4.ip_forward = 1 and routing on host B: [root@hostA: ~]# ip route 10.10.10.10 dev ppp0 proto kernel scope link src 10.10.10.152 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.111 10.10.10.0/24 dev ppp0 scope link 169.254.0.0/16 dev eth1 scope link routing on host A: [root@hostA: ~]# ip route 10.10.10.0 via 10.10.12.111 dev eth1 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.254 169.254.0.0/16 dev eth1 scope link default via 192.168.1.1 dev eth0 But still not able to ping 10.10.10.10 from host A. Any idea ? I'm pulling my hairs out.

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  • isolate web servers on intranet with dfl-800

    - by microchasm
    I administer a small network (10 users). I'm getting ready to deploy a internal webapp that will be hosted and accessed locally only. There are about 10 users on the network (192.168.111.0/24), a win2k3 server, apache (RHEL), and Mysql (RHEL), and various miscellaneous peripheries. I'd like to isolate the apache and sql boxes into a seperate area of the lan to keep things easier to maintain/grow. I've been reading about vlans, subnets, etc.. I'm not clear, however, which would be the best solution for our setup. Thanks for any tips and or advice.

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  • Odd internet packet routing

    - by NachoChip
    I want to know is there anyway to explicitly control the packet routing. I try to connect my computer in HK from San Francisco. It is extremely slow and I use tracert to see what is going on. It seems the packet get routed from HK to Europe and then to New York and then to San Francisco. In US, I am using Astound Cable. Is there any suggestion I can force the packet to not go around the world before it reach my computer? Or it is all ISP dependent?

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  • How do I set up a bridge on Ubuntu GNOME 14.04

    - by NJRandy
    I found a guide for setting up a bridge in Fedora and was trying this: $ nmcli connection delete p33p1 $ nmcli connection add con-name br0 type bridge ifname br0 autoconnect yes $ nmcli connection add con-name p33p1 type bridge-slave ifname p33p1 master br0 autoconnect yes I found that $ nmcli con delete uuid [uuid here] accomplished the first step. nmcli connection does not have an 'add' action in this distribution. Please help me do the 2nd and 3rd steps. Context: I am trying to set up a virtual machine. I believe this is a necessary step for the VM to access my network and the internet. Please feel free to correct me if I am wrong! BTW, I am a linux newbie, tech oldie. Thank you.

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  • TCPDump and IPTables DROP by string

    - by Tiffany Walker
    by using tcpdump -nlASX -s 0 -vvv port 80 I get something like: 14:58:55.121160 IP (tos 0x0, ttl 64, id 49764, offset 0, flags [DF], proto TCP (6), length 1480) 206.72.206.58.http > 2.187.196.7.4624: Flags [.], cksum 0x6900 (incorrect -> 0xcd18), seq 1672149449:1672150889, ack 4202197968, win 15340, length 1440 0x0000: 4500 05c8 c264 4000 4006 0f86 ce48 ce3a E....d@[email protected].: 0x0010: 02bb c407 0050 1210 63aa f9c9 fa78 73d0 .....P..c....xs. 0x0020: 5010 3bec 6900 0000 0f29 95cc fac4 2854 P.;.i....)....(T 0x0030: c0e7 3384 e89a 74fa 8d8c a069 f93f fc40 ..3...t....i.?.@ 0x0040: 1561 af61 1cf3 0d9c 3460 aa23 0b54 aac0 .a.a....4`.#.T.. 0x0050: 5090 ced1 b7bf 8857 c476 e1c0 8814 81ed P......W.v...... 0x0060: 9e85 87e8 d693 b637 bd3a 56ef c5fa 77e8 .......7.:V...w. 0x0070: 3035 743a 283e 89c7 ced8 c7c1 cff9 6ca3 05t:(>........l. 0x0080: 5f3f 0162 ebf1 419e c410 7180 7cd0 29e1 _?.b..A...q.|.). 0x0090: fec9 c708 0f01 9b2f a96b 20fe b95a 31cf ......./.k...Z1. 0x00a0: 8166 3612 bac9 4e8d 7087 4974 0063 1270 .f6...N.p.It.c.p What do I pull to use IPTables to block via string. Or is there a better way to block attacks that have something in common? Question is: Can I pick any piece from that IP packet and call it a string? iptables -A INPUT -m string --alog bm --string attack_string -j DROP In other words: In some cases I can ban with TTL=xxx and use that should an attack have the same TTL. Sure it will block some legit packets but if it means keeping the box up it works till the attack goes away but I would like to LEARN how to FIND other common things in a packet to block with IPTables

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  • Linux: prevent outgoing TCP flood

    - by Willem
    I run several hundred webservers behind loadbalancers, hosting many different sites with a plethora of applications (of which I have no control). About once every month, one of the sites gets hacked and a flood script is uploaded to attack some bank or political institution. In the past, these were always UDP floods which were effectively resolved by blocking outgoing UDP traffic on the individual webserver. Yesterday they started flooding a large US bank from our servers using many TCP connections to port 80. As these type of connections are perfectly valid for our applications, just blocking them is not an acceptable solution. I am considering the following alternatives. Which one would you recommend? Have you implemented these, and how? Limit on the webserver (iptables) outgoing TCP packets with source port != 80 Same but with queueing (tc) Rate limit outgoing traffic per user per server. Quite an administrative burden, as there are potentially 1000's of different users per application server. Maybe this: how can I limit per user bandwidth? Anything else? Naturally, I'm also looking into ways to minimize the chance of hackers getting into one of our hosted sites, but as that mechanism will never be 100% waterproof, I want to severely limit the impact of an intrusion. Cheers!

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  • How to Solve the "Unidentified network" in Windows 7

    - by gylns
    I connect the internet through Ad-hoc network, My machine uses win7 and another uses winows xp, There's no problem when I connect the XP machine, but if i disconnect and reconnect the net, then my local network is marked as "Unidentified network",unless restart the XP machine, I don't know why?

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  • Client can't reach my production webserver. It's their ISP's fault, but now what?

    - by MikeN
    I have a customer in Michigan who can't access my production SaaS webserver that is hosted on Slicehost. All other companies across the US/Canada/Europe have no problem reaching the site. This problem is occuring intermittantly, and Slicehost customer service says it's a problem with the client's ISP. I got the IP address of my client, and ping'ing that IP address from my PROD server fails, but ping'ing the IP address from my dev box or our seperate blog server (also hosted on slicehost) works. How do I debug a problem like this? I asked the client to reach out to their local ISP and ask about this problem. A traceroute shows that the packets are getting stopped on a Comcast Michigan node which is the client's ISP. Is there anything I can do additionally to fix this problem for my client?

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  • Need to detect the same application open on another computer on the network. Any software around tha

    - by Joe Schmoe
    I have a time management application that I use at home quite a lot and have running most of the time. At home, I have a desktop PC and a couple of laptops scattered around the house...all networked together. Unfortunately, the application I use is not multi-user and I risk losing/corrupting data if it has been left running on one computer inadvertently while I start using it on another one in another part of the house. I use Live Mesh to automatically keep the application's database synced across the different computers and I just need some way of making sure that I don't start using the application on another computer before closing it down on the previous one. Anyone know of any Windows software that can detect if an application is running simultaneously on different computers on my network, and warn me if I am about to have two open at the same time?

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  • is there a way to prespecify to overwrite files with same name?

    - by Celeritas
    Connections to network drives are ridiculously slow (e.g. 15kb/sec on really good days) and when I'm copying files I leave my desk. My problem is when there is a file with the same name to be overwritten, is there a way to specify in advanced to overwrite files? I know it has the option "do same for next x conflicts" but that doesn't popup until (in some cases) a long time after the files start copying. See my dilemma? Example: copying 500 files, estimated time 2 hours, I leave, after 10 minutes message comes up about file with same name and asks if it should overwrite (in this time copying stalls), I come back 30 minutes latter to find only the files in the 10 minutes copied. Out of curiosity how could the network speed be so bad? I asked the boss and he said because it gets routed around a lot and is just bad :(

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  • VMware server 2.0 SYN/ACK repeating issues

    - by user65579
    VMWare Server 2.0.0 Build 122956 I am having some issues with connecting into a guest VM (Ubuntu linux 4.4.3-4 lucid) running under VMware 2.0 on a windows server host. All connections to and from the VM's work fine, except for FTP. I thought the issue was the FTP daemon at first but it has been ruled out that it is not the daemon or the server itself. When you try to connect to the FTP server from outside of the host OS it fails with a "421 Service not available" but when you try and connect from the local VM or from the host OS the connection goes through fine. I have ran many packet sniffs using wireshark/tcpdump from the VM, the host OS, and the client connecting, the most informative is the host OS. I have attached a PNG of the relavant packets that were captured. I viewed some other network traffic that was sniffed (WWW specifically) and it seems to do the same syn/ack repeating but the user doesnt see any issues. I have disabled the firewall and the issues persisits, I have tried with specific allow rules to ensure the data is allowed and no changes. It appears like VMware attempts to do the ICMP redirect and it works, but then it vmware repeats the packets sent so you get 3 syn/ack's for every one syn from the client. Also VMWare appears to be attempting to establish an FTP connection between the HOST OS and the GUEST OS, because I see the second SYN sent from the HOST OS to the GUEST to initiate a new connection, and it get the appropriate SYN/ACK followed by an ACK, but the client never sees any of this from its end. EG. syn from client syn/ack from host OS to client syn/ack from guest OS to client syn/ack from host OS to client The same thing happens when the connection reset is attempted, RST's start being sent and repeated, the server responds with a valid header to continue the FTP handshake but the RST acknowledgement is allready issued and things are closed. I am not 100% if this is a bug in VMware or possibly a VMNetwork missconfiguration. Does anyone have any thoughts on where exactly the issue could be, things to try to verify or rule out? I have linked to a picture of the relevant packets sniffed from the host OS. http://img18.imageshack.us/img18/7789/vmwareftpconnection.jpg

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  • How Does EoR Design Work with Multi-tiered Data Center Topology

    - by S.C.
    I just did a ton of reading about the different multi-tier network topology options as outlined by Cisco, and now that I'm looking at the physical options (End of Row (EoR) vs Top of Rack(ToR)), I find myself confused about how these fit into the logical constructs. With ToR it also maps 1:1: at the top of each rack there is a switch(es) that essentially act as the access layer. They connect via fiber to other switches, maybe chassis-based, that act as the aggregation layer, that then connect to the core layer. With EoR it seems that the servers are connecting directly to the aggregation layer, skipping the access layer all together, by plugging directly into what are typically chassis switches. In EoR then is the standard 3-tier model now a 2-tier model: the servers go to the chassis switch which goes straight to the core switch? The reason it matters to me is that my understanding was that the 3-tier model was more desirable due to less complexity. The agg switch pair acts as default gateway and does routing; if you use up all of your ports in your agg layer pair it's much more complicated to add additional switches, than simply adding more switches at the access layer. Are there other downsides to this layout? Does this 3-tier architecture still apply in some way in EoR? Thanks.

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  • Sudden loss of Wi-Fi connectivity on OS X

    - by GJ.
    Occasionally while I work, without any special provocation, I lose connectivity via Wi-Fi. Other devices connected to the same wifi network have no interruption, and the problem gets resolved once I reboot my MacBook Air, so it's definitely a local problem. Observations: The Wi-Fi symbol in the menu indicates that I'm still connected, but apps can't actually connect neither to the Internet nor to other devices in the LAN. I can't connect to an alternate Wi-Fi network (e.g. Wi-Fi tethering via iPhone). I can connect to the Internet via iPhone USB tethering but this seems to only work some of the time. Only a reboot solves the problem but a regular restart gets stuck on a grey screen with rotating wheel (after all applications have closed) and I have to do a hard reset. How should I go about troubleshooting this? It used to happen very rarely but now is becoming more frequent (approaching once every 2-3 days on average).

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  • Alfa AWUSO36H 1W dysfunctional driver

    - by BrainStorm
    I recently purchased an Alfa AWUSO36H 1W wireless USB adapter for my notebook, in order to improve signal strength and quality. I'm currently using Linux Mint 11, and the it uses the RTL8187 driver for this adapter, I'm also using a 4dbi antenna, though I have others. The problem is that this adapter does exactly the opposite of what it should, actually my internal Broadcom BCM4313 adapter works way better than the alfa. Browsing is slow, some network applications don't even work, pings against Google.com on the internal adapter runs smooth, while in the alfa it gets like 25% packets lost or more! I'm less them 50 feet from my AP, the internal adapter gets 44/70 link quality, and the alfa gets around 60/70 (iwconfig output). Also the system always sets alfa power to 20dbm(100mw), then I have to do sudo iw set reg B0 to make it 30dbm(1000mw), but apparently no significant change. I've installed wireless-compat drivers, no change either. And worst of all, in Windows 7 it works way more smoothly for browsing, though I couldn't test it properly there. I hope its a driver problem, even if it's a pain to find/compile Linux drivers for a starter, I prefer it to a hardware problem where I would need to buy another adapter, since I have no money left (except for the cantenna pieces).

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  • Why can't my networks reach each other?

    - by HOLOGRAPHICpizza
    We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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  • how're routing tables populated?

    - by Robbie Mckennie
    i've been reading "tcp/ip illustrated" and i started reading about ip forwarding. all about how you can receive a datagram and work out where to send it next based on the desination ip and your routing table. but what confused me is how (in a home network setting) the table itself is populated. is there a lower layer protocol at work here? does it come along with dhcp? or is it simply based on the ip address and netmask of each interface? i do know (from other books) that in the early days of ethernet one had to set up routing tables by hand, but i know i didn't do that.

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  • VPN - local and remote networks IP collision

    - by Guido García
    I have created a VPN connection in Windows using the New Network Connection wizard that comes with Windows. It works without problems in most places, but there is one concrete place where, despite the connection to the remote public IP works fine, it is not able to validate the login/password and establish the VPN connection. In this place, the network is 10.0.0.x (the same I use in other places where I am able to connect). The remote network is 192.168.x.x, so I suspect there is some kind of IP collision, because before connecting, a traceroute to i.e. 192.168.0.40 does not fail. 1 4 ms 1 ms 1 ms LINKSYS [10.0.0.1] 2 5 ms 1 ms 1 ms 172.26.27.1 3 4 ms 5 ms 3 ms 192.168.1.100 ... (more) I can't modify the local network further than the first router (10.0.0.1). That is the only different I've found so far. Any idea about how to solve it? Thank you.

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  • Best way to troubleshoot intermittent network outages?

    - by Ben Scheirman
    We have a Comcast 50/10 line into our office. We keep seeing very short but sometimes frequent drops in our internet service. It's enough to kick you off of skype and stop any websites from loading, which is obviously affecting our productivity. We've tried 4 different routers, we've tried moving everyone off of wireless and onto wired via a switch and so far nothing has helped. Right now we're on a Cisco SB WRP400-G1 router. Attached to the router is a 16 port switch going to the ports in all of the offices. We've moved to OpenDNS in the case that it was the comcast DNS servers going down. Today we tried putting the modem, router, and switch on a UPS to make sure it wasn't power fluctuations that was causing it. Every time we call Comcast, by the time they are here the internet is working fine. I'd like to somehow prove that the problem is with Comcast, so if that means plugging in a machine directly into their router and collecting data all day, I'm up for that. I just want to hear ideas on what tools to run and how to collect this data. I could just continuously ping google.com all day long but I'm not sure how valuable that data would be. Thoughts?

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  • Will my internet address for my internal site cause my traffic to go external?

    - by Toby Allen
    If I have two domains pointing to the same machine, but one resolves to an internal address and the other to my internet facing router, will there be any differnce in route taken to my machine (primarily in terms of performanc). eg. internal.mydomain.com resolves to 192.168.1.200 external.mydomain.com resolves to A.Web.External.IP both eventually resolve back to the same machine. For a client in the network, will using the external address give a performance penalty?

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  • How to connect Android phone to a Wifi network using PPPoE?

    - by Slavo
    I have an ISP at home, which provides me with a PPPoE connection. My router supports that and I've configured it to autoconnect periodically, so I don't have to type my username and password each time. When I connect to the Wireless router from the PC, I have internet and everything works fine. However, when I do so using my Android phone, there's no internet connection on the phone. It connects to the router, but I cannot open any web page. How can I enable internet access from such an ISP on my phone? Is it something in the router setup? The router is Linksys WRT54GL.

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  • What does "incoming" and "outgoing" traffic mean?

    - by mgibsonbr
    I've seen many resources explaining how to set up a server's firewall to allow incoming and outgoing traffic on HTTP standard ports (80 and 443), but I can't figure out why I would need either of them. Do I need to unblock both for a "regular" web site to work? For file uploads to work? Are there situations where it would be advisable to unblock one and leave the other blocked? Sorry if that's a basic question, but I couldn't find it explained anywhere (also I'm not a native english speaker). I know in a "regular" web site the client is always the one who initiates a request, so I'm assuming a web server must accept incoming traffic on those ports, and my common sense tells me the server is allowed to send a response without unblocking anything else (otherwise it wouldn't make sense to have two types of rules). Is that correct? But what is an outgoing web (service) traffic, and what would be its use? AFAIK if the server wanted to initiate a connection with another machine, the specific port that matters is the one in the other end (i.e. the destination port would be 80), on its end any free port could be used (the source port would be random). I can open HTTP requests from my server (using wget for instance) without unblocking anything. So I'm assuming my concepts of "incoming" and "outgoing" are wrong somehow.

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  • Improve wireless performance

    - by djechelon
    Hello, I have a Trust Speedshare Turbo Pro router, which is running on channel 6. I found that the wireless signal (and network performance) dramatically drops from my PDA (I can barely attach to the network, even if I set the PDA's energy settings to maximum wireless performance) when I even exit my room, and I don't have shielded walls or something like that. I can't even stream a SD video from my desktop (connected via LAN) to my laptop using WiFi, while via LAN it works fine. I read that changing router's channel could improve performance due to interference reducing. I found that almost all wireless networks around here run on channels 6 and 11. I tried to go to my router's settings page to change channel, but I found that the combo box only allows me to select 6!! I'm not sure, but I may have been able in the past to change channel, though not to all of the available channels. A few minutes ago I tried a firmware upgrade, but it didn't solve my problem. My question is Is it possible that my router is someway locked to its channel? I bought it on my own, I didn't receive it from my ISP Apart from boosting the antenna power to the maximum (which, by the way, increases the EM radiation my and my family's bodies absorb 24/7 and is little more environment-unfriendly), do you have any tips on getting high quality transmission up to 5 metres from the antenna? Thank you

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